| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [vb mod] be | 12638 |
|
| 2 | [Wh det] [modal v] be | 12638 |
|
| 3 | [pron] must be | 9041 |
|
| 4 | [Wh det] must be | 702 |
|
| 5 | [Wh det] must [be] | 702 |
|
